Heater housing



FIG. 1 is a top perspective view of a heater housing showing my new design;

FIG. 2 is a side elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevation view thereof, the opposite side being a mirror image thereof; and,

FIG. 5 is a rear elevation view thereof.

The bottom (not shown) forms no part of the claimed design. The subject matter shown in broken lines is for environmental purposes only and forms no part of the claimed design. 

The ornamental design for a heater housing, as shown and described. 